Abstract: A device and system for automatically tracking a baseline input into a biometric sensor is provided. The device and system include a processing system with an amplifier having an input terminal and an output terminal for producing an output signal based on the input signal received by the input terminal. The processing system further includes at least one signal conditioning element coupled to the input terminal of the amplifier and configured to condition a compensation signal, and the processing system further includes a control circuit that adjusts one or more signal conditioning parameters of the at least one signal conditioning element based on the output signal of the amplifier. The at least one input signal received by the input terminal includes a combination of the at least one compensation signal and a signal from a first set of one or more receiver electrodes of the biometric sensor.

Abstract: Disclosed is an input device, comprising a touch sensor and a processing system. The touch sensor includes a touch sensing region and a plurality of pixels in the touch sensing region. The processing system is coupled to the touch sensor and comprises circuitry configured to: determine that a touch has occurred on a touch sensor; for each pixel included in the touch, receive touch information from the touch sensor; for each pixel included in the touch, determine a pixel response value for the pixel; and, compute a touch-based metric based on one or more pixel response values, wherein a model is used to perform behavioral authentication based on the touch-based metric.

Abstract: A method for initiating fingerprint capture in an electronic device is described. The device includes a touch screen with a sensing region, a touch controller, a fingerprint controller, and a host. The device is placed in a low power doze mode where the fingerprint controller is in a low power state and the device scans for an object proximate to the sensing region. When an object is proximate to the sensing region, the device executes a validation mode to determine whether the object is a fingerprint. When a fingerprint is detected, the device sends a wake up signal to the fingerprint controller and places the fingerprint controller in a high power mode. One or more fingerprint images are then captured.

Abstract: Disclosed are systems and methods that include a device for updating biometric data in an enrollment data set. The device includes a biometric sensor and a processor. The processor is configured to reject an authentication attempt based on a biometric input from the biometric sensor failing a first match determination, accept an additional authentication attempt based on an additional biometric input from the biometric sensor passing an auxiliary match determination, and update a biometric data repository based on the biometric input passing an auxiliary match determination.

Abstract: A device and system for automatically tracking a baseline input into a biometric sensor is provided. The device and system include a processing system with an amplifier having an input terminal and an output terminal for producing an output signal based on the input signal received by the input terminal. The processing system further includes at least one signal conditioning element coupled to the input terminal of the amplifier and configured to condition a compensation signal, and the processing system further includes a control circuit that adjusts one or more signal conditioning parameters of the at least one signal conditioning element based on the output signal of the amplifier. The at least one input signal received by the input terminal includes a combination of the at least one compensation signal and a signal from a first set of one or more receiver electrodes of the biometric sensor.

Abstract: Embodiments described herein include a method for calibrating capacitive force sensors. The method includes measuring a force level at each of a first electrode and a second electrode. The method also includes determining an expected force level at the second electrode based on the measured force level at the first electrode and a force contribution ratio for the second electrode. The method includes determining a difference between the measured force level at the second electrode and the expected force level at the second electrode and adjusting a force weighting factor for the second electrode in response to the difference exceeding a predetermined threshold to create an adjusted force weighting factor. The method also includes adjusting the measured force level at the second electrode.

Abstract: A method of operating a force-sensitive input device having an input surface comprises declaring a first press action upon detecting an amount of force applied to the input surface that exceeds a first no-press force value by at least a first press threshold value, determining a maximum force value applied to the input surface during the first press action, and setting a release threshold value for a subsequent release action based on the determined maximum force value.

Abstract: A force-sensitive input device and related method and processing system are disclosed. The input device comprises a first substrate mounted to a housing and defining a touch surface extending along first and second dimensions. The input device further comprises a second substrate disposed within the housing on a side of the first substrate opposite the touch surface. The second substrate comprises a first sensor electrode disposed along a periphery of the touch surface in the first and second dimensions, and a second sensor electrode disposed along the periphery of the touch surface and at least partly circumscribing the first sensor electrode in the first and second dimensions. The input device further comprises a processing system configured to perform capacitive sensing using the first and second sensor electrodes to determine a deflection of the first substrate relative to the housing in response to force applied to the touch surface.

Abstract: A capacitive sensing device is configured to detect force being applied to an input surface of the device by an input object, in addition to the position of the input object using touch sensing methods. Embodiments generate a compensation factor that is used to determine the force information in order to compensate for physical changes to the capacitive sensing device over time, air-gap non-uniform distribution, and other mechanical variations and changes.

Abstract: An input device includes a first sensor array having a first plurality of sensor electrodes disposed in a sensing area, wherein the first sensor array has a first pixel density, and a second sensor array having a second plurality of sensor electrodes disposed in the sensing area, wherein the second sensor array has a second pixel density different from the first pixel density. The input device also includes a processing system coupled to the second plurality of sensor electrodes and configured to electrically float a sensor electrode in the second plurality of sensor electrodes during a sensing period of the first sensor array.

Abstract: A method and system for fingerprint imaging in an electronic device having a display, a touch sensor with a touch interface and an optical fingerprint sensor with a sensing region is described. The method and system include placing the electronic device in a hover detect mode, the hover detect mode scanning for a hovering finger; detecting the hovering finger; initiating illumination in the sensing region to image a fingerprint of the finger; capturing an image of the fingerprint in the sensing region; and disabling the illumination in the sensing region.

Abstract: An example a processing system for a capacitive sensing device includes a reference transmitter coupled to a reference capacitance. The processing system further includes a charge accumulation circuit having an input coupled to the reference transmitter through the reference capacitance and configured to generate an integrated signal, a demodulator circuit having an input coupled to an output of the charge accumulation circuit and configured to demodulate the integrated signal to generate at least one demodulated signal, a sampling circuit having an input coupled to an output of the demodulator circuit and configured to sample the demodulated signal(s), a first reference buffer coupled to an output of the sampling circuit, the first reference buffer outputting a first voltage reference for the capacitive sensing device, and a second reference buffer coupled to the output of the sampling circuit, the second reference buffer outputting a second voltage reference for the capacitive sensing device.

Abstract: Embodiments described herein include a method for calibrating capacitive force sensors. The method includes measuring a force level at each of a first electrode and a second electrode. The method also includes determining an expected force level at the second electrode based on the measured force level at the first electrode and a force contribution ratio for the second electrode. The method includes determining a difference between the measured force level at the second electrode and the expected force level at the second electrode and adjusting a force weighting factor for the second electrode in response to the difference exceeding a predetermined threshold to create an adjusted force weighting factor. The method also includes adjusting the measured force level at the second electrode.

Abstract: A method for using a fingerprint sensor on a mobile device to determine which hand is being used to operate the mobile device includes: acquiring, by a processor, sensing data from the fingerprint sensor corresponding to a finger sensed by the fingerprint sensor; determining, by the processor, an orientation of the finger based on the acquired sensing data; and generating, by the processor, a signal for indicating which hand is being used to operate the mobile device based on the determined orientation of the finger.

Abstract: A capacitive sensing device is configured to detect force being applied to an input surface of the device by an input object, in addition to the position of the input object using touch sensing methods. Embodiments generate a compensation factor that is used to determine the force information in order to compensate for physical changes to the capacitive sensing device over time, air-gap non-uniform distribution, and other mechanical variations and changes.

Abstract: An example input device for force and proximity sensing includes a plurality of touch electrodes including touch transmitter electrodes and touch receiver electrodes, and a force electrode layer including a plurality of force electrodes. The input device further includes a resilient material layer disposed between the plurality of touch electrodes and the force electrode layer. The input device further includes a processing system coupled to the plurality of touch electrodes and the plurality of force electrodes, the processing system configured to: drive the transmitter electrodes with touch transmitter signals and acquire a transcapacitive proximity measurement from the touch receiver electrodes; and drive the plurality of force electrodes with force transmitter signals and acquire a transcapacitive force measurement from either the touch transmitter electrodes or the touch receiver electrodes.

Abstract: An example processing system for a capacitive sensing device includes sensor circuitry coupled to first and second pluralities of sensor electrodes. The sensor circuitry is configured to, in a first sensing operation, drive the first plurality of sensor electrodes at a first sensing frequency and the second plurality of sensor electrodes a second sensing frequency to acquire first changes in capacitance and second changes in capacitance, respectively, wherein the first and second sensing frequencies are substantially orthogonal. The sensor circuitry is configured to, in a second sensing operation, drive the first plurality of sensor electrodes at the first sensing frequency and the second plurality of sensor electrodes a third sensing frequency to acquire third changes in capacitance and fourth changes in capacitance, respectively, wherein the first sensing frequency and the third sensing frequency are substantially orthogonal.

Abstract: An input device includes a first sensor array having a first plurality of sensor electrodes disposed in a sensing area, wherein the first sensor array has a first pixel density, and a second sensor array having a second plurality of sensor electrodes disposed in the sensing area, wherein the second sensor array has a second pixel density different from the first pixel density. The input device also includes a processing system coupled to the second plurality of sensor electrodes and configured to electrically float a sensor electrode in the second plurality of sensor electrodes during a sensing period of the first sensor array.

Abstract: A method for initiating fingerprint capture in an electronic device is described. The device includes a touch screen with a sensing region, a touch controller, a fingerprint controller, and a host. The device is placed in a low power doze mode where the fingerprint controller is in a low power state and the device scans for an object proximate to the sensing region. When an object is proximate to the sensing region, the device executes a validation mode to determine whether the object is a fingerprint. When a fingerprint is detected, the device sends a wake up signal to the fingerprint controller and places the fingerprint controller in a high power mode. One or more fingerprint images are then captured.

Abstract: A method for using a fingerprint sensor on a mobile device to determine which hand is being used to operate the mobile device includes: acquiring, by a processor, sensing data from the fingerprint sensor corresponding to a finger sensed by the fingerprint sensor; determining, by the processor, an orientation of the finger based on the acquired sensing data; and generating, by the processor, a signal for indicating which hand is being used to operate the mobile device based on the determined orientation of the finger.